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<Title>Multi-Bar Chart</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Multi-Bar Chart</p>
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<img src="images/multibar.png" width='400' height='240'>
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This example demonstrates a multi-bar chart, in which bars are clustered. It also demonstrates using alternative plot area background colors, and putting legends internal to the plot area.<br><br>
A multi-bar chart is a bar chart in which multiple data sets are represented by drawing the bars side by side in a cluster. The multi-bar layer is created by using <a href="XYChart.addBarLayer2.htm">XYChart.addBarLayer2</a> with the <a href="Chart.Side.htm">Side</a> predefined constant.<br><br>
In this example, the two alternative background colors in the plot area is achieved by specifying two background colors in <a href="PlotArea.setBackground.htm">PlotArea.setBackground</a>. ChartDirector also supports another method <a href="PlotArea.setAltBgColor.htm">PlotArea.setAltBgColor</a> that can be used for both horizontal and vertical alternative background colors.<br><br>
Note that in this example, a margin is configured at the top of the plot area for the legend keys. This is achieved by using <a href="Axis.setMargin.htm">Axis.setMargin</a>.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/multibar.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data for the bar chart
double[] data0 = {100, 125, 245, 147, 67};
double[] data1 = {85, 156, 179, 211, 123};
double[] data2 = {97, 87, 56, 267, 157};
String[] labels = {"Mon", "Tue", "Wed", "Thu", "Fri"};

// Create a XYChart object of size 400 x 240 pixels
XYChart c = new XYChart(400, 240);

// Add a title to the chart using 10 pt Arial font
c.addTitle("         Average Weekday Network Load", "", 10);

// Set the plot area at (50, 25) and of size 320 x 180. Use two alternative background colors
// (0xffffc0 and 0xffffe0)
c.setPlotArea(50, 25, 320, 180, 0xffffc0, 0xffffe0);

// Add a legend box at (55, 18) using horizontal layout. Use 8 pt Arial font, with transparent
// background
c.addLegend(55, 18, false, "", 8).setBackground(Chart.Transparent);

// Add a title to the y-axis
c.yAxis().setTitle("Throughput (MBytes Per Hour)");

// Reserve 20 pixels at the top of the y-axis for the legend box
c.yAxis().setTopMargin(20);

// Set the x axis labels
c.xAxis().setLabels(labels);

// Add a multi-bar layer with 3 data sets and 3 pixels 3D depth
BarLayer layer = c.addBarLayer2(Chart.Side, 3);
layer.addDataSet(data0, 0xff8080, "Server #1");
layer.addDataSet(data1, 0x80ff80, "Server #2");
layer.addDataSet(data2, 0x8080ff, "Server #3");

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "",
    "title='{dataSetName} on {xLabel}: {value} MBytes/hour'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Multi-Bar Chart&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Multi-Bar Chart
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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<br><hr class="separator"><div class="copyright">&copy; 2022 Advanced Software Engineering Limited. All rights reserved.</div>
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